Turbo Buicks, 83-84 Hurst Olds and 84-85? 442 Olds have a 8.5'' ring gear, posi, 3.73 gears and are a bolt in swap. If you can live with a different bolt pattern in the rear and have fabrication skills, the Ford explorer 8.8 is about the same width. You will need to weld brackets to it, but it comes with up to 4.10 gears, posi, and disc brakes.